Monitor Postfix queue performance

Postfix is an open source, SMTP-based MTA that helps organizations manage email routing and delivery efficiently while providing protection against common email issues. Datadog integrates with Postfix to monitor its performance metrics such as queue sizes for incoming, active, and deferred queues. By tracking these metrics, users can establish a baseline value and set monitors to alert them of any significant deviations from the norm. This integration also allows users to visualize, aggregate, and correlate email metrics with other systems or software in their stack, as well as detect outliers and abnormal behavior automatically.